<template>
    <div class="sidebar">
        <el-menu
            class="sidebar-el-menu"
            :default-active="onRoutes"
            :collapse="collapse"
            background-color="#324157"
            text-color="#bfcbd9"
            active-text-color="#20a0ff"
            unique-opened
            router
        >
            <template v-for="item in items">
                <template v-if="item.subs">
                    <el-submenu :index="item.index" :key="item.index">
                        <template slot="title">
                            <i :class="item.icon"></i>
                            <span slot="title">{{ item.title }}</span>
                        </template>
                        <template v-for="subItem in item.subs">
                            <el-submenu
                                v-if="subItem.subs"
                                :index="subItem.index"
                                :key="subItem.index"
                            >
                                <template slot="title">{{ subItem.title }}</template>
                                <el-menu-item
                                    v-for="(threeItem,i) in subItem.subs"
                                    :key="i"
                                    :index="threeItem.index"
                                ><i :class="threeItem.icon"></i>{{ threeItem.title }}</el-menu-item>
                            </el-submenu>
                            <el-menu-item
                                v-else
                                :index="subItem.index"
                                :key="subItem.index"
                            >
                            <i :class="subItem.icon"></i>
                            {{ subItem.title }}
                            </el-menu-item>
                        </template>
                    </el-submenu>
                </template>
                <template v-else>
                    <el-menu-item :index="item.index" :key="item.index">
                        <i :class="item.icon"></i>
                        <span slot="title">{{ item.title }}</span>
                    </el-menu-item>
                </template>
            </template>
        </el-menu>
    </div>
</template>

<script>
import bus from '../common/bus';
export default {
    data() {
        return {
            collapse: false,
            items: [
                {
                    icon: 'el-icon-lx-home',
                    index: '/dashboard', 
                    title: '系统首页'
                },
                {
                    icon: 'el-icon-setting',
                    index: '/setting',
                    title: '网站设定',
                    subs: [
                        {
                            icon: 'el-icon-setting',
                            index: '/setting',
                            title: '网站设定',
                        },
                        {
                            icon: 'el-icon-s-tools',
                            index: '/setting/list',
                            title: '设定管理',
                        }
                    ]
                },
                {
                    icon: 'el-icon-key',
                    index: '/rights',
                    title: '权限管理'
                },
                {
                    icon: 'el-icon-s-custom',
                    index: '/role',
                    title: '角色管理'
                },
                {
                    icon: 'el-icon-user',
                    index: '/user',
                    title: '用户管理'
                },
                {
                    icon: 'el-icon-medal',
                    index: '/level',
                    title: '等级管理'
                },
                {
                    icon: 'el-icon-notebook-2',
                    index: '/article',
                    title: '文章管理',
                    subs: [
                        {
                            icon: 'el-icon-notebook-2',
                            index: '/article',
                            title: '文章列表',
                        },
                        {
                            icon: 'el-icon-edit-outline',
                            index: '/article/publish',
                            title: '发布文章',
                        },
                        {
                            icon: 'el-icon-collection-tag',
                            index: '/article/sort',
                            title: '分类管理',
                        },
                        {
                            icon: 'el-icon-chat-line-square',
                            index: '/article/comment',
                            title: '评论管理',
                        }
                    ]
                },
                {
                    icon: 'el-icon-s-platform',
                    index: '/infoBlock',
                    title: '信息块管理'
                },
                {
                    icon: 'el-icon-s-comment',
                    index: '/board',
                    title: '留言板管理'
                },
                {
                    icon: 'el-icon-s-promotion',
                    index: '/links',
                    title: '友情链接'
                },
            ]
        };
    },
    computed: {
        onRoutes() {
            return this.$route.path;
        }
    },
    created() {
        // 通过 Event Bus 进行组件间通信，来折叠侧边栏
        bus.$on('collapse', msg => {
            this.collapse = msg;
            bus.$emit('collapse-content', msg);
        });
    }
};
</script>

<style lang="scss" scoped>
.sidebar {
    display: block;
    position: absolute;
    left: 0;
    top: 70px;
    bottom: 0;
    overflow-y: scroll;
}
.sidebar::-webkit-scrollbar {
    width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
    width: 250px;
}
.sidebar > ul {
    height: 100%;
}

/deep/.el-menu{
    .is-active{
        background-color: rgb(40,52,70)!important;
    }
} 
</style>
